SOLUTION: Assume that SAT scores vary normally with a standard deviation of 100. How many students should be sampled if we want to estimate the population mean SAT at 90% confidence with a m

SOLUTION: Assume that SAT scores vary normally with a standard deviation of 100. How many students should be sampled if we want to estimate the population mean SAT at 90% confidence with a m

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Question 924053: Assume that SAT scores vary normally with a standard deviation of 100. How many students should be sampled if we want to estimate the population mean SAT at 90% confidence with a margin of error equal to 25?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
ME = z(sd/sqrt(n))
n = [z*s/ME]^2
...........
n = (1.645(100)/25)^2 = 44 (43.2964 to the next whole number)
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